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DIRECT ACTING ENGINE.

(Application filed May 25, 1897.)

Patented Nov. 8, I898.

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UNITED STATES ATENT Fries.

JOHN P. SIMMONS, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO SQUIRE V. MOONEY, OF SAME PLACE.

DIRECT-ACTING ENGINE.

SPECIFICATION forming part of Letters Patent No. 613,805, dated November 8, 1898.

Application filed May 25, 1897. SerialNo. 638,1 l4. (No model.)

To all whom it may concern.-

Beit known that I, JOHN P. SIMMONS, a citizen of the United States, residing in the city and county of San Francisco and State of California, have invented a new and useful Improvementin Direct-ActingEngines, of which the following is a specification.

This invention relates to the class of engines designed particularly to operate impact rock-drills.

It consists in the novel construction and combination of the several parts hereinafter fully described and specifically claimed.

The objectof the invention is to provide a simple, cheap, and efficient device for operating the distributing-valve in this form of engine, whereby a more economical use is made of the actuating fluid. I accomplish these objects by means of the devices illustrated in the accompanying drawin gs, in which Figure 1 shows a plan,porti0ns being broken to more clearly illustrate the invention. Fig. 2 shows an elevation, portions being in section.

Referring to the drawings, A is a cylinder of a direct-acting engine.

B is a tubular valve-chest extending from end to end of the cylinder and closed at each end by a suitable cap. A double-ended piston-Valve B slides freely in the valve-chest. The periphery of each piston-head of the piston-valve B is provided witha series of cellular depressions, forming a number of D- valves around the circumference. Near each end of the valve-chest is a port I), communicating with the cylinder. There is also an exhaust-port 1) adjacent to the inlet-port. Intermediate of the ends there is provided a longitudinal opening or passage C,connecting the interior of the valve-chest with the interior of the cylinder.

As each end of the cylinder and valve mechanism is a duplicate of the other, the description of one end applies equally to the other.

In one of the side walls of the space C is a port 0, opening into a passage 0, which communicates With the end of the valve-chest, and adjacent to the port 0 is an exhaust-port c communicating with the exterior. A rockarm D, centrally pivoted upon a pin E, is provided in the space 0, having a D-valve cl at each end suitably arranged to control the inlet and exhaust ports 0 and 0 The rockarm D is also provided at each end with a tappetprojection d which extends slightly within the bore of the cylinder A and adapted to engage with and be operated .by suitable cam-surfaces which are provided upon the engine-piston H in cylinder A. An inlet F is provided for the admission of the actuat- 4 ing fluid, and an exhaust-outlet G is also pro vided at each end of the valve-chest.

The operation of the device is as follows: The engine-piston by its motion engages one end of the rock-arm D, thereby causing the D-valve at the opposite end to establish connection between passage 0 and exhaust 0 which that end controls. This unbalances the pressure upon the ends of the piston-valve B, and it moves to the exhausted end, thereby reversing the direction of the actuating fluid upon the engine-piston, and consequently the direction of motion of the engine-piston, and the described operation is repeated on the other side of the valve mechanism.

What I claim as new is- I 1. In a direct-acting engine, a cylinder a piston therein, a Valve-chest extending the whole length of the cylinder with inlet and exhaust ports at each end,a double-ended piston-valve having a series of circumferential depressions controlling these ports adapted to be operated by fluid-pressure, and means actuated by the engine-piston adapted to control the fluid-pressure upon the ends of the piston-valve.

2. In a direct-acting engine, a cylinder, a piston therein having valve-operating in- 'clines, a valve-chest extending the Whole length of the cylinder with an inlet and an exhaust port at each end a double-ended piston-valve having a series of circumferential depressions controlling these ports, a passage 5 extending from each end of the valve-chest, whereby the pressure upon the ends of the piston-valve is controlled and a rock-arm adapted to control the flow of fluid in said passages. 10o

In a direct-acting engine a cylinder, a depressions adapted to control the How of the piston therein having valve-oper2rtinginactuating fluid to either end of the cylinder ciines, a rock-arm located in the live-steam. substantially as described.

space provided at each end with a D-Vaive JOHN P. SIMMONS. adapted to be operated by said piston, and a \Vitnesses: double-ended piston-valve the ends of which W. A. MCKOWEN,

are providedp'ith a series of circumferential 1 J. MILLER. 

